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x+(x+2)+(x+4)=-105
We move all terms to the left:
x+(x+2)+(x+4)-(-105)=0
We add all the numbers together, and all the variables
x+(x+2)+(x+4)+105=0
We get rid of parentheses
x+x+x+2+4+105=0
We add all the numbers together, and all the variables
3x+111=0
We move all terms containing x to the left, all other terms to the right
3x=-111
x=-111/3
x=-37
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